衛えい生せい学がく

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Meanings

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hygienics; hygiene science

Academic field studying health maintenance and disease prevention through cleanliness and environmental control.

He is majoring in hygienics at university.

衛えい生せい学がくの観かん点てんから、手て洗あらいは非ひ常じょうに重じゅう要ようだ。

From the perspective of hygiene science, handwashing is extremely important.